<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        html,body {
            width: 100vw;
            height: 100%;
            overflow-x: hidden;

        }
        .wrapper {
            background-color: antiquewhite;
            width: 1000px;
            height: 100%;
            margin: auto;
        }
        p {
            white-space: pre-wrap;
        }
        @media only screen and (max-width: 480px) {
            .wrapper {
                width: 100%;
            }
        }
        header {
            display: none;
        }
    </style>
</head>
<body>
    <header>我是头部</header>
    <div class="wrapper">
        <p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Nulla tenetur dolores, laudantium, ea qui iusto rerum quibusdam expedita recusandae ad deserunt? In, minus eligendi nostrum incidunt optio temporibus explicabo aliquam.</p>
    </div>
</body>
</html>